Flashcards in Chapter 2 Deck (10):
The OSI model has 7 layers what are they?
Application- layer 7
Presentation- layer 6
Transport- layer 4
Network- layer 3
Data Link- layer 2
Physical - layer 1
The application layer.
The application layer serves as the window ( interface ) for users and application processes to access network services.
The presentation layer.
The presentation layer formats the data to be presented to the application layer. It can be viewed as the translator for the network. This layer may translate data from a format used by the application layer into a common format at the sending station, then translate the common format to a format known to the application layer at the receiving station.
The Session layer
The session layer allows session establishment between processes running on different stations. It provides:
1- Session establishment, maintenance and termination: allows two application processes on different machines to establish, use and terminate a connection, called a session.
2- Session support: performs the functions that allow these processes to communicate over the network, performing security, name recognition, logging, and so on.
The transport layer.
The transport layer ensures that messages are delivered error-free, in sequence, and with no losses or duplications. It relieves the higher layer protocols from any concern with the transfer of data between them and their peers.
The Network layer.
The network layer controls the operation of the subnet, deciding which physical path the data should take based on network conditions, priority of service, and other factors
The data link layer
The data link layer provides error-free transfer of data frames from one node to another over the physical layer, allowing layers above it to assume virtually error-free transmission over the link.
The physical layer.
The physical layer consists of the basic networking hardware transmission technologies of a network.
in which layer are the frames encoded from 1s and 0s into digital signal?